Question

The mean of 25 observations is N, the total of the observations is 300, while ∑_(i=1)^25▒〖(x_i-N)^2=625〗. Find
The value of N (2 Marks)
The standard deviation of the observation (2 Marks)
Briefly describe the following methods of data collection highlighting one advantage and one disadvantage (6 Marks)
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Answer 1

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